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1 | diff --git a/include/linux/compiler-gcc6.h b/include/linux/compiler-gcc6.h |
2 | new file mode 100644 | |
3 | index 0000000..622117b | |
4 | --- /dev/null | |
5 | +++ b/include/linux/compiler-gcc6.h | |
6 | @@ -0,0 +1,65 @@ | |
7 | +#ifndef __LINUX_COMPILER_H | |
8 | +#error "Please don't include <linux/compiler-gcc6.h> directly, include <linux/compiler.h> instead." | |
9 | +#endif | |
10 | + | |
11 | +#define __used __attribute__((__used__)) | |
12 | +#define __must_check __attribute__((warn_unused_result)) | |
13 | +#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) | |
14 | + | |
15 | +/* Mark functions as cold. gcc will assume any path leading to a call | |
16 | + to them will be unlikely. This means a lot of manual unlikely()s | |
17 | + are unnecessary now for any paths leading to the usual suspects | |
18 | + like BUG(), printk(), panic() etc. [but let's keep them for now for | |
19 | + older compilers] | |
20 | + | |
21 | + Early snapshots of gcc 4.3 don't support this and we can't detect this | |
22 | + in the preprocessor, but we can live with this because they're unreleased. | |
23 | + Maketime probing would be overkill here. | |
24 | + | |
25 | + gcc also has a __attribute__((__hot__)) to move hot functions into | |
26 | + a special section, but I don't see any sense in this right now in | |
27 | + the kernel context */ | |
28 | +#define __cold __attribute__((__cold__)) | |
29 | + | |
30 | +#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) | |
31 | + | |
32 | +#ifndef __CHECKER__ | |
33 | +# define __compiletime_warning(message) __attribute__((warning(message))) | |
34 | +# define __compiletime_error(message) __attribute__((error(message))) | |
35 | +#endif /* __CHECKER__ */ | |
36 | + | |
37 | +/* | |
38 | + * Mark a position in code as unreachable. This can be used to | |
39 | + * suppress control flow warnings after asm blocks that transfer | |
40 | + * control elsewhere. | |
41 | + * | |
42 | + * Early snapshots of gcc 4.5 don't support this and we can't detect | |
43 | + * this in the preprocessor, but we can live with this because they're | |
44 | + * unreleased. Really, we need to have autoconf for the kernel. | |
45 | + */ | |
46 | +#define unreachable() __builtin_unreachable() | |
47 | + | |
48 | +/* Mark a function definition as prohibited from being cloned. */ | |
49 | +#define __noclone __attribute__((__noclone__)) | |
50 | + | |
51 | +/* | |
52 | + * Tell the optimizer that something else uses this function or variable. | |
53 | + */ | |
54 | +#define __visible __attribute__((externally_visible)) | |
55 | + | |
56 | +/* | |
57 | + * GCC 'asm goto' miscompiles certain code sequences: | |
58 | + * | |
59 | + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 | |
60 | + * | |
61 | + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. | |
62 | + * | |
63 | + * (asm goto is automatically volatile - the naming reflects this.) | |
64 | + */ | |
65 | +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) | |
66 | + | |
67 | +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP | |
68 | +#define __HAVE_BUILTIN_BSWAP32__ | |
69 | +#define __HAVE_BUILTIN_BSWAP64__ | |
70 | +#define __HAVE_BUILTIN_BSWAP16__ | |
71 | +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ |